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Well, to be honest you cant get the perfect curve with sintra. The curve is a sort of 3d cup curve, and it doesnt really curve like that. So, that being said.

For a single curve its sort of an angle. from the outer upper corner to the inner lower conCAVE spot (first curve up from the lowest INNER ANGLED part of the armour plate.

Using a trash / waste can (look at the trash can armour thread) will give you an idea of the closest curve to 'right. The only difference is after that curve is in the armour the upper curve, which is 'bow shaped' then has to be curved inward (towards your spine for lack of a better example).

Which isnt possible with sintra, unless you boil it and set it on someting that shape. But if you had something that shape, you wouldnt need to use sintra ehh?

I hope that helps. My suggestion is to use a trash can in stead of sintra, if for no other reason than to get the angles so they all match, and make a nice 'flat' front.

Remember that the tighter you get it to your vest, the better the armour looks. It creates a 'plane' instead of multiple planes.

actually Seeker has a video floating around here somewhere where he makes a chest piece from start to finish and he's able to get the perfect curve on it. He used a master mold (I think it was made from acrylic, but bondo would work too) that was a perfect copy of what the armor should look like. He heated his sintra up so hot that it was downright flimsy, then he stuck it on a huge cushion and pushed his master mold onto it from above. Just press and hold and it'll be the perfect shape, I guess. Making the mold will take a long time though

This is the second time I've seen a reference to making a mold with Bondo and I'll admit, I'm a little lost.

(I'm also a complete neophyte and am picking up my first batch of Bondo tomorrow.)

I want to try Seeker's method for shaping the Sintra, but am slightly confused as to how a mold like that could be made from bondo. Everything I've seen is that it's more of less quick setting slime. How does one get the shape right and then subsequently the curve?

I apologize for the complete ignorance in the question but I've yet to see this answered in my searches.. Gotta learn sometime, eh? ;-)